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# Which of the following expressions is defined for all

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Director
Joined: 12 Jun 2006
Posts: 532

Kudos [?]: 157 [0], given: 1

Which of the following expressions is defined for all [#permalink]

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01 Jun 2007, 00:37
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Which of the following expressions is defined for all integer values of z, such athat z^2 < 9?

z+1/z

z-4/z^2 - 4z + 4

18/z^2 - 4z - 5

none
1 only
2 only
3 only
2 and 3

corrected, thanks.

Last edited by ggarr on 01 Jun 2007, 01:47, edited 2 times in total.

Kudos [?]: 157 [0], given: 1

VP
Joined: 08 Jun 2005
Posts: 1144

Kudos [?]: 239 [0], given: 0

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01 Jun 2007, 00:58
you made a mistake in choice II

http://www.gmatclub.com/phpbb/viewtopic.php?t=37505

Kudos [?]: 239 [0], given: 0

Director
Joined: 13 Nov 2003
Posts: 789

Kudos [?]: 59 [0], given: 0

Location: BULGARIA

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01 Jun 2007, 02:40
Hi
since z can take values 2,1,0,-1,-2 and all of the expressions have z in denominator( division of 0 is not defined ) then z can not be 0 and ans is none

Kudos [?]: 59 [0], given: 0

01 Jun 2007, 02:40
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